I've been meaning to do this for a while. I've just started a Halo novel and already he's shown a feat.
I will be using feats from the book, but anyone is free to post feats from the game. Every time I come across a noteworthy feat I will post, after all the books are canon. I'll start off with one and update it later.
Taken from The Fall of Reach.
Explosive needles bounced off the Chief’s armor, detonating as they hit the ground. He saw the flash ofa plasma bolt—side stepped—and heard the air crackle where he had stood a split second before.
Showing his armor's durability. Note: That he was getting shot at by Grunts, referred to as well armed Grunts. They were also heavy in numbers.
One other problem: there were easily a thousand of them.
^ As shown.
Will post more later.